的AsyncTask用的readObject（）

Question

util.concurrent.FutureTask.finishCompletion 當我嘗試打開內部存儲上的文件，我不知道如何處理，如果你有一些建議幫助我，請

我的代碼：

 protected String doInBackground(Hashtable<String,String>... params) { 
     Hashtable ht=params[0]; 

     String json=HelperHttp.getJSONResponseFromURL(url, ht); 
     System.out.println(json); 

     try { 
      jObj = new JSONObject(json); 
       ObjectOutput out = new ObjectOutputStream(new FileOutputStream(new File(getCacheDir(),"")+"cacheFile.srl")); 
       out.writeObject(jObj.toString()); 
       out.close(); 
     } catch (JSONException e) { 
      // TODO Auto-generated catch block 
      e.printStackTrace(); 
     } catch (FileNotFoundException e) { 
      // TODO Auto-generated catch block 
      e.printStackTrace(); 
     } catch (IOException e) { 
      // TODO Auto-generated catch block 
      e.printStackTrace(); 
     } 



     if(json!=null) {try { 
      ObjectInputStream in = new ObjectInputStream(new FileInputStream(new File(new File(getCacheDir(),"")+"cacheFile.srl"))); 
      JSONObject jsonObject; 
     try { 
      jsonObject = (JSONObject) in.readObject(); 
      JSONArray articles = jsonObject.getJSONArray("posts"); 

      for(int i = 0; i < articles.length(); i++){ 
        JSONObject c = articles.getJSONObject(i); 

        // Storing each json item in variable 
        AO=c.getJSONObject("post"); 


        String fr_titre = AO.getString("fr_titre"); 
        Log.d("hhhhhhhhhh", fr_titre); 

        lista.add(fr_titre); 

     } 
     } catch (ClassNotFoundException e) { 
      // TODO Auto-generated catch block 
      e.printStackTrace(); 
     } 
      in.close(); 


     } catch (JSONException e) { 
     // TODO Auto-generated catch block 
     e.printStackTrace(); 
    } catch (ObjectStreamException e) { 
      // TODO Auto-generated catch block 
      e.printStackTrace(); 
     } catch (FileNotFoundException e) { 
      // TODO Auto-generated catch block 
      e.printStackTrace(); 
     } catch (IOException e) { 
      // TODO Auto-generated catch block 
      e.printStackTrace(); 
     } 
    } else{ 
     return "Invalid Company Id"; 
     } 

     return "SUCCESS"; 
     } 

堆棧跟蹤：

04-11 11:52:04.694: E/AndroidRuntime(1026): FATAL EXCEPTION: AsyncTask #1 
04-11 11:52:04.694: E/AndroidRuntime(1026): java.lang.RuntimeException: An error occured while executing doInBackground() 
04-11 11:52:04.694: E/AndroidRuntime(1026):  at android.os.AsyncTask$3.done(AsyncTask.java:299) 
04-11 11:52:04.694: E/AndroidRuntime(1026):  at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:352) 
04-11 11:52:04.694: E/AndroidRuntime(1026):  at java.util.concurrent.FutureTask.setException(FutureTask.java:219) 
04-11 11:52:04.694: E/AndroidRuntime(1026):  at java.util.concurrent.FutureTask.run(FutureTask.java:239) 
04-11 11:52:04.694: E/AndroidRuntime(1026):  at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1080) 
04-11 11:52:04.694: E/AndroidRuntime(1026):  at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:573) 
04-11 11:52:04.694: E/AndroidRuntime(1026):  at java.lang.Thread.run(Thread.java:856) 
04-11 11:52:04.694: E/AndroidRuntime(1026): Caused by: java.lang.ClassCastException: java.lang.String cannot be cast to org.json.JSONObject 
04-11 11:52:04.694: E/AndroidRuntime(1026):  at com.cgi.activity.ActivityListNews$GetDeptAyncTask.doInBackground(ActivityListNews.java:81) 
04-11 11:52:04.694: E/AndroidRuntime(1026):  at com.cgi.activity.ActivityListNews$GetDeptAyncTask.doInBackground(ActivityListNews.java:1) 
04-11 11:52:04.694: E/AndroidRuntime(1026):  at android.os.AsyncTask$2.call(AsyncTask.java:287) 
04-11 11:52:04.694: E/AndroidRuntime(1026):  at java.util.concurrent.FutureTask.run(FutureTask.java:234) 
04-11 11:52:04.694: E/AndroidRuntime(1026):  ... 3 more 

Answer 1

你寫一個字符串：

out.writeObject(jObj.toString()); 

，但你把它轉換爲一個JSONObject當你讀它：

jsonObject = (JSONObject) in.readObject(); 

可以讀取它，將它轉換爲一個字符串，然後解析它：

jsonObject = new JSONObject((String) in.readObject());